Qualitative Results. The visual comparisons of different methods are shown in Figs. REF , REF  for \(2\times \)  SR and Figs. REF , REF  for \(4\times \)  SR, respectively. It can be observed from the zoom-in regions that SISR methods cannot reconstruct reliable details, especially for \(4\times \)  SR. The scene "Bedroom" from HCInew [1]} contains complex stripes which are hard for SR methods to recover. The results achieved by bicubic interpolation and SISR methods are blurry on the stripes regions in Fig. REF . The scene "Cards" from STFgantry [2]} is a challenging scene due to the occlusions and complex structures. The results achieved by EDSR [3]} show blurring artifacts around the words, and the results achieved by RCAN [4]} contain ghosting artifacts.
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